Ritoque Formation

The Ritoque Formation (Spanish: Formación Ritoque, Kiri, Kirt) is a geological formation of the Altiplano Cundiboyacense, Eastern Ranges of the Colombian Andes. The formation consists of grey siltstones, limestones and fine sandstones intercalated. The formation dates to the Early Cretaceous period; Early Hauterivian epoch and varies in thickness between 70 and 110 metres (230 and 360 ft).

Ritoque Formation
Stratigraphic range: Early Hauterivian ~
Type	Geological formation
Underlies	Paja Formation
Overlies	Rosablanca Fm., Arcabuco Fm.
Thickness	70–110 m (230–360 ft)
Lithology
Primary	Siltstone
Other	Limestone
Location
Coordinates	4°27′07″N 74°03′20″W
Region	Altiplano Cundiboyacense Eastern Ranges, Andes
Country	Colombia
Type section
Named for	Vereda Ritoque, Villa de Leyva
Named by	Etayo
Location	Villa de Leyva
Year defined	1968
Coordinates	4°27′07″N 74°03′20″W
Region	Boyacá, Santander
Country	Colombia

Definition

The formation was first defined and named by Etayo in 1968 after the vereda Ritoque of Villa de Leyva.

Description

Lithologies

The Ritoque Formation is characterised by a sequence of grey siltstones, limestones and sandstones with a thickness between 70 and 110 metres (230 and 360 ft).

Stratigraphy and depositional environment

The Ritoque Formation overlies the Rosablanca and Arcabuco Formations and is overlain by the Paja Formation. The age has been estimated to be Early Hauterivian. Stratigraphically, the formation is time equivalent with the Macanal Formation.

Outcrops

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Type locality of the Ritoque Formation on the Altiplano Cundiboyacense

The Ritoque Formation is found, apart from its type locality near Villa de Leyva, Boyacá, found in the vicinity.

See also

Geology of the Eastern Hills

Geology of the Ocetá Páramo

Geology of the Altiplano Cundiboyacense

References

Bibliography

• Galvis Arenas, Beatriz Elena; Valencia Escobar, José Leonardo (2009), Contribución en la determinación de los posibles paleoambientes de las rocas Cretáceas Tempranas sobre la vía Tunja-Villa de Leyva (entre Alto del Arrayán - Peaje Sáchica) y sectores aledaños, departamento de Boyacá (BSc. thesis) (PDF), Universidad de Caldas, pp. 1–127, retrieved 2019-03-10
• Gómez Cruz, Arley de Jesús; Bermúdez, Hermann D.; Vega, Francisco J. (2015), "A new species of Diaulax Bell, 1863 (Brachyura: Dialucidae) in the Early Cretaceous of the Rosablanca Formation, Colombia", Boletín de la Sociedad Geológica Mexicana, 67: 103–112, doi:10.18268/BSGM2015v67n1a8, retrieved 2017-04-04
• Villamil, Tomas (2012), Chronology Relative Sea Level History and a New Sequence Stratigraphic Model for Basinal Cretaceous Facies of Colombia, Society for Sedimentary Geology (SEPM), pp. 161–216

Maps

• Pulido González, Orlando (2009), Plancha 151 - Charalá - 1:100,000, INGEOMINAS, p. 1, retrieved 2017-06-06
• Ulloa, Carlos E; Rodríguez, Erasmo (2009), Plancha 170 - Vélez - 1:100,000, INGEOMINAS, p. 1, retrieved 2017-06-06
• Renzoni, Giancarlo; Rosas, Humberto (2009), Plancha 171 - Duitama - 1:100,000, INGEOMINAS, p. 1, retrieved 2017-06-06
• Fuquen M., Jaime A; Osorno M, José F. (2009), Plancha 190 - Chiquinquirá - 1:100,000, INGEOMINAS, p. 1, retrieved 2017-06-06
• Renzoni, Giancarlo; Rosas, Humberto; Etayo Serna, Fernando (1998), Plancha 191 - Tunja - 1:100,000, INGEOMINAS, p. 1, retrieved 2017-06-06

External links

• Gómez, J.; Montes, N.E.; Nivia, Á.; Diederix, H. (2015), Plancha 5-09 del Atlas Geológico de Colombia 2015 – escala 1:500,000, Servicio Geológico Colombiano, p. 1, retrieved 2017-03-16